Checkerwork



Jul 28, 1931. J. P. GRILLI ET AL CHECKERWORK Filed July 15; 1929 2 Sheets-Sheet l fizz/671E16 John Pfi/illll,

' .Har'r l Wd/zerbae, 6:5 W

July 28, 1931.

J. P. GRILL] ET AL CHECK EEEE RK Filed July 15, 1929 2 Sheets-Sheet 2 Patented duly 1931 UNITED STATES D JOHN rmmr GRILLI up may L. wnrm'mnnu, or CHICAGO, ILLINOIS, ASSIGNORS mo 11. A. BBAssEB'r & comramr, or

ILLINOIS PATENT OFFICE CHICAGO, ILLINOIS, A. CORPORATION OI CHECKERWOBK Application jfiled July 15, 1929. Serial lie. 378,279.

This invention relates to a new and improved checkerwork' for regenerators, and moreparticularly to. checkerwork especially adapted for use in connection with hot blast stoves of the types used with blast furnaces.

Hot blast stoves or the like consist of shells which are filled with brick checkerwork, the function of the brick being to absorb heat from the products of combustion coming from the blast furnace or similar metallurgical furnace and to give up heat to the air to be used in lasting the furnace.

The efliciency of a hot blast stove, or similar regenerative apparatus depends primarily upon the efliciency of the heat transfer. For a given volume of heat absorbing brick, the greater the surface exposed to the hotgases or to the cold air, the more eflicient is the transfer of the heat from the heated gases to the brick and in turn thetransfenof heat from the heatedbrick to the cold air going toward the furnace. It is essential that the passages for flow of gas and air be so proportioned as to bring about proper contact between the brick surfaces and the heated gases and thecold air in order that heat may be transferred to and from the buck.

According to the construction of the present invention rectangular brick are used to build up the bodyof the checkerwork, these brick being laid in such way that square openings or fiues are formed extendmg vertlcally through the c 'eokerwork. Each course-of rectangular br1 k is preferably laid to break joint with the courses above and below it.- Rcctangular brick of different sizes are used in certain of the courses so that in these courses lateral openin are provided which aiford communicationgi etween certain of the adjacentvertical fiue's. In one course there may be communication between flues ad acent each other in' one direction and in another course communication between flues adj acent at right angles to the previously mentioned lines of communication.

This communication afforded between vertical fiues is of im ortance in that it-permits the equalization o pressures in the flues and also permits a by-passing ofgases or air so that an entire flue'will not be lost to use if or the like.

an obstruction occurs in it. The gases or air be of different sizes in different vertical sections of the checkerwork so as to maintain an approximately uniform velocity of the gases flowing through them.. The gases or air are hottest at the top of "the checkerwork and here the filler brick may be omitted. The volume of the gases or air is less in lower portions of the stoves where temperatures are lower and here the filler brick may be of increased size. The filler brick are preferably so placed in the checkerwork as to break joint vertically with the rectangular main checkerbrick which assists in maintainingthe stability of the structure and the prevention of lateral displacement of one course of brick on another, with'consequent blocking of the vertical flues. The'filler brick -also render the accurate-laying up of the main checkerbrick more easy and further assist in holding them in position *under the strains due 'to the changes in temperature throughout the heat transfer cycle.

It is an object of the present. invention to provide a new and improved checkerwork especially adapted for use in hot blast stoves It is a further object of the invention to provide a construction havin' vertically extending fiues and sodesigns cross communication between adjacent flues.

It is an additional object to provide a con -struction in which the several brick used as to providecan by-pass such an obstruction and return lot to the main dues, with additional or brick located in the fines;

it is a further object'to provide an ecient heat transfer structure which is composed of simple units adapted for commercial production and installation.

()ther and further objects will appear as V the description proceeds.

We have illustrated certain preferred embodiments of our invention in the accompanying drawin s, in which- Figure l is-a ragmentary vertical section through a typical checker-work;

Figure 2 is a perspective view of one of the filler supporting members Figure 3 is a perspective view of one of the filler members;

Figure d is a fragmentary horizontal section taken on line 4;& of Figure 1;

Figure 5 is a fragmentary horizontal sec: tion taken on line 55 of Figure l;

Figure 6 is a fragmentary horizontal sectiontaken on line 66 of Figure l;

Figure '2' is a fraentary horizontal section-taken on line 7-7 of Figure l; and

Figure 8 is a fragmentary horizontal section taken on line 88 of Figure l,

In the drawings, the lowermost courses or brick 11 are formed of usual rectangular;

brick, and supported on the bottom arches of the stove in any usual manner. The filler supporting members 12 are sup orted on the brick course 11 and placed int c formation best shown in Fire 8.. These members 12 have the angular-y related meeting surfaces 13 and are spaced apart by the brick M which have similar chamfered-meeting surfaces 15. The supporting members 12 have their lateral portions 16 formed the full height of the brick and filler brick used in the checkerwork. They have an intermediate cross surface 1? located at half the height of the supporting member and consequently at half the height of the filler brick,

, The filler brick '18 shown in Figure 8 have a thickened central pdrtionl-Q and ends or edge portions 20 formed to fit into the corners oi the square or rectangular openings into which the filler brick are to be fitted. The lowermost course of filler brick rests upon the surfaces 17 of the supporting members 12, The checkerwork immediately above the bottom course is shown in cross section in Figure, 7 and consists of the filler brick 18, the full size brick 21 and the part size brick 22. In order that it may be clear as to just how the several horizontal sections {of Figures 4: to 8 are superposed, points have been marked A and it will be understood that the points marked A will he superposed throughout the construction.

Theconstruction as shown in Fi re 8 is formed of the filler brick 18, full size brick 2i and part size brick 22, but'with the brick placed in difierent relation to that in which siaeos they are shown in Figure 7, By comparison of the points marked A of these two fires, it will be apparent that each full size rick 21 of Figure .6 extends across between and rests upon the part size brick 22 in Figure 7. The part size brick 22 of Figure 6 are at right angles to and placed upon the part size brick 22 of Figure '2', extending also so as to rest on the adjacent ends of the lower full size brick 21. In the construction shown, I the filler brick18 in Figure 6 are superposed on the filler brick 18 of Figure 7, Y

Referring now to the form of construction shown in Figures 4 and 5, these are made up of the full size brick 2land the filler brick 18. The full size brick 21 are so'placed as to form square passageways for the reception of the filler brick 18. These filler brick l8 divide the square passageways into the smaller approximately triangular passageways 23. The form of construction shown in Figure 4 is similar to that of Figure 5, with the exception that the brick 21in Figure 4 break jolnt with the lower brick 21 of Figure 5, and the filler brick 18 of Figure 4c are placed at right angles to the filler brick 18 rectangular brick 21 and 22. This breaking of joints between the filler and main brick gives the construction stability against lateral displacement.

it will also be noted from consideration of Figures 4- to 7, that the various brick 2i and 22 break joint with each other in successivelayers in the horizontal direction, which gives thestructure stability in this direction.

7 By a consideration of the superposed points A of Figures 4 to 7, it will be apparent that the substantially triangular openings 23 of Figures 4 and 5 register with smaller portionsof larger openings in Figures 6 and 7. Thus when the various layers of these four figures are superposed there is provision of cross passages between adjacent vertical passages in one direction in the form of construction shown in Figure 6, and in the opposite direction in the form of construction shown in Figure 7. Thus the blocking of any passage at any given point does not render that portion of the checkerwork useless throughout the height of the stove, as ample provision is made for the icy-passing of the gases fromone passage to another to get by any obstruction.

It will be understood that the showing of Figure 1 is diagrammatic in character and that large. numbers of adjacent courses of brick may be similar in character as the usual Mill iii

structure will contain many times the numtires 6 and 7, where there is cross communication between adjacent flues, may be modified as desired, these being placed at diflI'erent points throughout the height of the structure. It will be further understood that the, filler brick shown in Figure 3 maybe made of different thicknesses, the thicker brick being used in lower portions of the structure.

10 We have shown certain preferred embodiments of our invention by way of illustration, but itis capable of change and modification to meet varying conditions and we contemplate such changes and modifications as come within the spirit and scope of the appended claims.

We claim: 1. A checkerwork construction, comprising a plurality of rectangular brick built 11 to form vertical flues, certain of the bric being shorter than others in horizontal length and having their ends spaced from adjacent brick whereby cross passages are formed between certain of the vertical flues.

'2. A checkerwork construction, comprising a plurality of rectangular brick built up in horizontal courses tov form vertical flues, the brick breaking joint horizontally, and avertical series of'filler brick in certain 0 of the flues, said filler brick breaking joint vertically with the rectangular brick.

' 3. A checkerwork construction, comprising a plurality of rectangular brick built up in horizontal courses to form vertical flues,

said brick being built to form cross passages connecting certain of the vertical flues, and a vertically extending continuous series of filler brick in certain of the flues.

4'. A checkerwork construction, compris- 40 ing a plurality of rectangular brick built up in horizontal courses to form vertical flues, said brick being built to form cross passages connecting certain of the vertical flues, and a vertically extending continuous series of filler brick in certain of the flues, the filler brick breaking joint vertically with the main checker brick.

Signed at Chicago, Illinois, this 13th day of July, 1929. 1

1 JOHN P. GRILLI.

HARRY L. WETHERBEE. 

